A drive circuit for driving a first drive element having a first terminal and a second terminal and driving a second drive element having a third terminal and a fourth terminal, includes a first drive signal output circuit that is electrically coupled to the first terminal and outputs a first drive signal, a second drive signal output circuit that is electrically coupled to the third terminal and outputs a second drive signal, a reference voltage signal output circuit that outputs a reference voltage signal having a constant reference voltage value, and a first switch circuit having one end electrically coupled to an output terminal of the reference voltage signal output circuit and the other end electrically coupled to the second terminal and the fourth terminal. The first switch circuit switches whether or not to supply a second constant voltage signal to the second terminal and the fourth terminal.

A liquid discharging apparatus includes: a discharging head that discharges liquid onto a medium; first and second components that are operable for discharging the liquid onto the medium; first and second control circuits that control driving of the discharging head; a first control circuit board on which the first control circuit is provided; a second control circuit board on which the second control circuit is provided; wherein the first component is electrically coupled to the first control circuit, the second component is electrically coupled to the second control circuit, a minimum distance between the first control circuit board and the first component is shorter than a minimum distance between the first control circuit board and the second component, and a minimum distance between the second control circuit board and the second component is shorter than a minimum distance between the second control circuit board and the first component.

There is provided a liquid discharge apparatus includes a first transistor in which a second terminal and a third terminal are electrically coupled to according to a first terminal, a second transistor in which a fifth terminal and a sixth terminal are electrically coupled to according to a fourth terminal, and a coil that has one end electrically coupled to the second terminal and the sixth terminal, and the other end electrically coupled to the discharge head, a shortest distance between the second terminal and the one end of the coil is shorter than that between the third terminal and the one end of the coil, a shortest distance between the sixth terminal and the one end of the coil is shorter than that between the fifth terminal and the one end of the coil.

Provided is a liquid discharging apparatus including a drive signal output circuit that displaces between a first potential and a second potential, and a discharging portion discharging liquid, in which the drive signal output circuit includes a modulation circuit, an amplification circuit, and a demodulation circuit that includes a first capacitor and a second capacitor and outputs a drive signal, the first potential is 25 V or higher, the first capacitor and the second capacitor are coupled to each other in parallel, a change rate of an electrostatic capacitance of the first capacitor when a direct-current voltage is supplied to the first capacitor is smaller than a change rate of an electrostatic capacitance of the second capacitor when the direct-current voltage is supplied to the second capacitor, and an equivalent series resistance component of the second capacitor is smaller than an equivalent series resistance component of the first capacitor.

Provided is a liquid discharging apparatus including a modulation circuit, an amplification circuit, and a demodulation circuit that includes a first capacitor, a second capacitor, and an inductor and outputs the drive signal, one end of the first capacitor and one end of the second capacitor are coupled to one end of the inductor, the first capacitor and the second capacitor are coupled to each other in parallel, the first capacitor includes a first laminated portion in which a resin thin film layer and a first metal thin film layer are laminated, the second capacitor includes a second laminated portion in which a ceramic thin film layer and a second metal thin film layer are laminated, and the electrostatic capacitance of the first capacitor is larger than the electrostatic capacitance of the second capacitor.

A liquid discharge apparatus includes a head including a piezoelectric element and a nozzle, the head configured to drive the piezoelectric element to discharge a liquid from the nozzle, a drive waveform generator configured to generate a drive waveform to be applied to the piezoelectric element of the head, the drive waveform including a non-discharge pulse configured to drive the piezoelectric element to a degree at which the liquid is not discharged from the nozzle, and a discharge pulse applied to the piezoelectric element after the non-discharge pulse, the discharge pulse configured to drive the piezoelectric element to discharge the liquid from the nozzle, a switch between the head and the drive waveform generator, the switch configured to be switched to an ON-state in which the drive waveform passes the switch or to an OFF-state in which the drive waveform does not pass the switch.

There is provided a printing device, which includes a print engine provided with an ejection head configured to eject droplets of ink introduced from a container containing the ink and configured to perform printing using the ink droplets on a recording sheet, and a controller. The controller is configured to automatically set a drive signal pattern defining a signal pattern to drive the ejection head in accordance with contract information concluded for the printing device or for a use by a user of the printing device.

A liquid ejecting apparatus includes an integrated circuit, and a feedback circuit that feeds back a feedback signal. The integrated circuit includes a modulation circuit that output a modulation signal, a constant voltage output circuit that outputs a DC voltage signal, and an input terminal to which the feedback signal is input. The modulation circuit and the constant voltage output circuit are electrically coupled to the input terminal, a first line segment located between the input terminal and the constant voltage output circuit in a first straight line connecting the input terminal and the constant voltage output circuit at a shortest distance does not intersect the modulation circuit, and a second line segment located between the input terminal and the modulation circuit in a second straight line connecting the input terminal and the modulation circuit at a shortest distance does not intersect the constant voltage output circuit.

Printheads and methods of operation. In one embodiment, a printhead includes a plurality of jetting channels comprising first jetting channels configured to jet a first print fluid and second jetting channels configured to jet a second print fluid, and a driver circuit communicatively coupled to actuators of the jetting channels. The driver circuit receives a drive waveform comprising non-jetting pulses and jetting pulses, and gating signals comprising a first active gating signal designated for jetting the first print fluid, and a second active gating signal designated for jetting the second print fluid. The driver circuit selectively applies the non-jetting pulses and the jetting pulses to actuators of the first jetting channels based on the first active gating signal to jet the first print fluid, and selectively applies the jetting pulses to actuators of the second jetting channels based on the second active gating signal to jet the second print fluid.

A liquid ejecting apparatus includes a print head including a drive element; a first circuit substrate electrically coupled to the print head; a second circuit substrate electrically coupled to the first circuit substrate; and a fixing portion that fixes the second circuit substrate to the first circuit substrate, wherein the first circuit substrate includes a coupling terminal electrically coupled to the print head, and a first substrate on which the coupling terminal is provided, wherein the second circuit substrate includes a drive signal output circuit that outputs a drive signal for driving the drive element and a second substrate on which the drive signal output circuit is provided, and wherein the fixing portion also serves as a output terminal through which the drive signal is output to the first circuit substrate.